I have found a method that works 100% of the time for me. It sounds silly but bear with me. After the hiccup starts, I tell myself “hiccups arent real” or some equivalent phrase, in my inner voice, as convincingly as possible. Like I actually believe it. It stops immediately, before the second hiccup.

I am spreading this method among friends and family, I would say around a third of then report successes, but Im pretty sure not all of them have tried it seriously and some brush it off as bs.